Bradley J. Roth

TL;DR: The effects of coil orientation, stimulus intensity, and shape of the induced current pulse on the amplitudes of motor evoked potentials in the left abductor pollicis brevis of 10 normal adults who had transcranial magnetic stimulation are studied.

TL;DR: The butterfly-shaped coil induced the largest currents under its center, where the circumferences of the two component coils come together, and the component of the electric field parallel to the wire in the center of this coil was the largest and most localized.

TL;DR: In this paper, the authors describe a mathematical algorithm to obtain an image of a two-dimensional current distribution from measurements of its magnetic field, and the spatial resolution of this image is determined by the signal-to-noise ratio of the magnetometer data and the distance between the magnetometers and the plane of the current distribution.

TL;DR: A nonlinear Hodgkin-Huxley cable model describes the response of the nerve fiber to this induced electric field and predicts complicated dynamics such as action potential annihilation and dispersion.

TL;DR: This work has shown that when the anisotropy ratios of the intracellular and extracellular spaces are not equal, the injection of current into the tissue induces a transmembrane potential that has a complicated spatial dependence, including adjacent regions of depolarized and hyperpolarized tissue.